Flame retardancy and mechanical properties of polyamide 6 modified by multiple reactions with furan-phosphamide
Flame retardancy and mechanical properties of polyamide 6 modified by multiple reactions with furan-phosphamide
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DOI：
10.1016/j.polymer.2020.122994
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发表时间：
2020-12-01
期刊：
影响因子：
4.6
通讯作者：
Li, Juan
中科院分区：
文献类型：
--
作者：
Sun, Jinhao;Qian, Lijun;Li, Juan
聚酰胺6（PA 6）由于其固有的易燃性，在许多领域存在安全隐患。本文将呋喃磷酰胺（POCFA）引入到尼龙6中，通过二者之间的多重反应来调节其阻燃性能和力学性能。结果表明，5 wt%的POCFA使PA 6达到UL-94 V0等级和27.2 vol%的LOI。PA 6的力学性能在加工后有所下降，但经过一段时间后可以恢复。这是由于POCFA和PA 6在加工和应用过程中发生了多重反应。首先，POCFA催化了PA 6的降解，使其分子量降低，流动性增加，以熔融方式提高了PA 6的阻燃性能。其次，POCFA与PA 6之间的反应将呋喃环接枝到PA 6链上，从而使不同呋喃环之间发生Diels-Alder加成反应，使PA 6的分子链得到延长，力学性能得到改善。本研究为平衡PA 6复合材料的阻燃性能和力学性能提供了一种很好的方法。
Polyamide 6 (PA6) has potential safety hazards in many fields due to its intrinsic flammability. In this paper, furan-phosphamide (POCFA) was introduced into PA6 to regulate its flame retardancy and mechanical properties via multiple reactions between them. The results showed that 5 wt% POCFA makes PA6 achieve the UL-94 V0 rating and a LOI 27.2 vol%. The mechanical properties of PA6 were decreased after processing, but these properties can recover after a period of time. This is caused by the multiple reactions between POCFA and PA6 during processing and application. Firstly, POCFA catalyzes the degradation of PA6 resulting in the decrease of molecular weight and the increase of fluidity, which improves the flame retardancy of PA6 by melting-away mode. Secondly, the reactions between POCFA and PA6 graft furan ring onto PA6 chain, thus Diels-Alder addition reactions can occur between different furan rings, which extend the molecular chain of PA6, and improve the mechanical properties. This work provides a good method to balance the flame retardancy and mechanical properties of PA6 composites.